<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script>
			(function (){
				console.log(1)
			})();
			
			document.onclick = function (){
				alert(1);
			}
			
			setInterval(function () {
				console.log(444);
			},1000);
			
			setInterval("fn()",1000);
		</script>
	</body>
</html>
